• Mustang Forums
  • 1965 - 1973 Classic Mustangs -General/Talk-
  • Classic Mustang Specific Tech

Engine RPM with C4 Trans question.

  • Thread starter Thread starter spirockp
  • Start date Start date Jan 30, 2007

spirockp

5 Year Member
Mar 26, 2004
465
12
39
NJ
Jan 30, 2007
#1
  • Jan 30, 2007
  • #1
At 60 miles an hour my RPM was at about 2,800. Does that sound right to you guys?

I thought my C4 trans in my 66 Coupe was not going into 3rd gear, so I drove it to a local trans place and they knew about the older C4's with the dots instead of D,2, and 1. And they explained how it worked and yes it is going into 3rd, but again at 60 miles an hour it's a 2,800 RPM.

Can anyone verify this?

I believe the stock gears are 3:50 but I will have to check that out to verify.

Thanks.

Peter S.
 

krash kendall

Active Member
Nov 19, 2004
1,258
0
36
Aldergrove, B.C. Canada
Jan 30, 2007
#2
  • Jan 30, 2007
  • #2
That's roughly what I get with my C4 and 3.50 ratio 9 inch.
 

spirockp

5 Year Member
Mar 26, 2004
465
12
39
NJ
Jan 30, 2007
#3
  • Jan 30, 2007
  • #3
I guess it also has to deal with rear tire size.

I'm running 225/50/R15
 

spirockp

5 Year Member
Mar 26, 2004
465
12
39
NJ
Jan 30, 2007
#4
  • Jan 30, 2007
  • #4
Is there different gear ratios in the early C4 trans's (65 and or 66), you know the one's with the dots instead of D,2, and 1?
 
1

10secgoal

Active Member
Dec 1, 2003
2,801
3
49
San Diego
Jan 30, 2007
#5
  • Jan 30, 2007
  • #5
Third gear is 1 to 1. You just have gears my man.
 
You must log in or register to reply here.

Similar threads

Drivetrain 83’ Glx convertible C5 Trans help!
  • JacksonJared2113
  • Dec 25, 2025
  • Fox 5.0 Mustang Tech
Replies
2
Views
366
Fox 5.0 Mustang Tech Dec 26, 2025
JacksonJared2113
Progress Thread Progress Thread- From6to8's 95 GT/Saleen Supercharged 331 install
  • from6to8
  • Mar 22, 2026
  • 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk-
  • 2
Replies
24
Views
798
1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- May 6, 2026
from6to8
B
Questions About T5 Manual
  • Blackout67
  • Apr 13, 2025
  • 1996 - 2004 SN95 Mustang -General/Talk-
Replies
10
Views
569
1996 - 2004 SN95 Mustang -General/Talk- Apr 22, 2025
89ripper
K
TKX Transmission Shifting Problem
  • KWC156
  • Jun 23, 2025
  • Other Auto Tech
  • 2
Replies
21
Views
2K
Other Auto Tech Jun 13, 2026
427nostang
4
B
Car limp mode no codes
  • Brysen
  • Dec 25, 2024
  • 2005 - 2014 S-197 Mustang -General/Talk-
Replies
2
Views
221
2005 - 2014 S-197 Mustang -General/Talk- Jan 2, 2025
89ripper
Share:
Bluesky Email Share Link
  • Mustang Forums
  • 1965 - 1973 Classic Mustangs -General/Talk-
  • Classic Mustang Specific Tech
Menu
Log in

Register

  • Forums
  • What's new
  • Media
  • Resources
  • Contact
  • Sponsor
X

Privacy & Transparency

We use cookies and similar technologies for the following purposes:

  • Personalized ads and content
  • Content measurement and audience insights

Do you accept cookies and these technologies?

X

Privacy & Transparency

We use cookies and similar technologies for the following purposes:

  • Personalized ads and content
  • Content measurement and audience insights

Do you accept cookies and these technologies?